A variadic function is a function that can accept a variable number of arguments. In Go, a variadic function is indicated by an ellipsis (…) preceding the type of the final parameter in the function signature. For example, here is a simple variadic function that takes a variable number of integers and returns their sum:
func sum(nums ...int) int {
total := 0
for _, num := range nums {
total += num
}
return total
}
To call this function, you can pass it any number of integers as arguments. For example:
sum(1, 2, 3, 4, 5) // returns 15
sum(1, 2, 3) // returns 6
sum(1) // returns 1
You can also pass a slice of integers to a variadic function using the … operator. For example:
numbers := []int{1, 2, 3, 4, 5}
sum(numbers...) // returns 15
It’s important to note that the … operator must be placed after the slice name when calling a variadic function with a slice, rather than before the slice type as it is in the function definition.
You can use variadic functions to create functions that are flexible and can handle a variable number of arguments. This can be particularly useful when you want to create functions that can be called with a varying number of arguments depending on the needs of the caller.
I hope this helps! Let me know if you have any questions.